The Amiad SAF Series are sophisticated, yet easy-to-operate, automatic filters, with a self-cleaning mechanism driven by an electric motor. The “SAF” filters support flow-rates of up to 400 m³/h (1760 GPM), with various screens designed to cover a range of 800-10 micron filtration degree, and are available in inlet/outlet diameters of 2”-10”.
Raw water enters the filter inlet (1) through the coarse screen (2) which protects the cleaning mechanism from large debris. The water passes through the fine screen (3), trapping dirt particles which accumulate inside the filter.
Clean water flows through the filter outlet (4).
The gradual dirt buildup on the inner screen surface causes a filter cake to develop, with a corresponding increase in the pressure differential across the screen. A pressure differential switch senses the increased pressure differential and when it reaches a pre-set value, the cleaning process begins.
Cleaning of the filter is carried out by the suction scanner (5) which spirals across the screen; the open exhaust valve creates a high velocity suction stream at the nozzles tip which “vacuums” the filter cake from the screen. During the self-cleaning process, which takes between 20 to 40 seconds, filtered water continues to flow downstream.
Two types of control boards are available for the SAF filters: PLC or Electro-Mechanical Relay and Timer. The self-cleaning cycle begins under any one of the following conditions:
1. Receiving a signal from the Pressure Differential Switch (6)
2. Time interval parameter set at the control board
3. Manual Start
The control board also provides:
Amiad’s “SAF” product-line consists of the following models:
SAF-1500 for up to 80 m³/h (350 gpm)
SAF-3000 for up to 150 m³/h (660 gpm)
SAF-4500 for up to 250 m³/h (1100 gpm)
SAF-6000 for up to 400 m³/h (1,760 gpm)